Control apparatus for internal combustion engine

A control apparatus for an internal combustion engine for variably controlling an opening/closing timing of an intake valve and an exhaust valve of the internal combustion engine in response to an engine operating condition, the apparatus comprising:

• a memory for storing a fuel control parameter as a plurality of data preset on the basis of an intake pressure and an rpm of the internal combustion engine;
• a valve opening/closing element provided on a camshaft which is operably connected with a crank shaft of the internal combustion engine for drivingly opening/closing the intake valve and the exhaust valve in synchronism with a rotation of the crank shaft;
• a rotational phase controller for shifting a rotational phase of the camshaft relative to the crank shaft;
• a shift amount detector for detecting a shift amount of the rotational phase of the camshaft relative to the crank shaft caused by the rotation shift controller;
• a compensator for calculating control data on the basis of the intake pressure and the rpm of the engine and the plurality of data of the fuel control parameter stored in the memory and for compensating the calculated data on the basis of the detection value of the shift amount detector;
• and
• a fuel injection amount controller for controlling a fuel injection amount to each cylinder of the internal combustion engine in accordance with data in which the fuel control parameter has been compensated for;
• wherein the fuel control parameter has a change-rate change maximum point at which a change in a change rate of the fuel control parameter relative to the shift amount of the cam shaft is at maximum, and the data of the fuel control parameter is determined in advance for each shift amount substantially corresponding to the change-rate change maximum point.